Transcript for Luckiest Man in America Dodges Two Close Calls in Boston and Texas

Experts tell us the odds of having two disasters like texas and boston in the same week, are one in every 4,800 years. So what then are the odds of one man being an eyewitness to both? Here's abc's cecilia vega. Reporter: Joe berti finished the boston marathon in three hours and 56 minutes flat. And then minutes later, this. I heard the explosion and it was loud. So I turned around and saw the smoke coming from the finish line. So at that instant I just felt like, it was a bomb. You thought right away it was a bomb? Absolutely. Because of how loud it was and where it was. Literally seconds later, the second bomb exploded. Reporter: Berti's wife amy was just ten yards away from the explosion. A woman standing next to her lost a leg. But amy was fine. Two days later back home in texas, berti was driving from a meeting. He saw a huge fire raging in the distance and then a familiar sound. The blast from the exploded fertilizer plant in west, texas, so strong it rocked berti's car. I was trying to figure out what it was, was it a terrorist attack? Did someone drop a bomb on us? The size of it was just incredible. Reporter: Are you thinking, what? Again? Yeah, I was just thinking i can't believe this is happening. Reporter: Maybe it was luck, perhaps fate. Berti has another way of looking at it. I feel blessed. You know, my wife was ten yards from a major explosion. And hundreds of people around her are critically injured, and she doesn't even have a scratch on her. I was 30 seconds to the finish line and uninjured. So we both feel blessed. Reporter: Two explosions in one week, it sounds pretty unlucky. Joe berti walked away without a scratch, and those, dan, are some pretty good odds.

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